<template>
  <div class="row">
    <div v-for="column of columnList" :key="column.id" class="col-4 mb-4">
      <div class="card h-100 shadow-sm">
        <div class="card-body text-center">
          <img
            :src="column.avatar"
            :alt="column.title"
            class="rounded-circle border border-light w-25 my-3"
          >
          <h5 class="card-title">{{column.title}}</h5>
          <p class="card-text text-left">{{column.description}}</p>
          <a href="#" class="btn btn-outline-primary">进入专栏</a>
        </div>
      </div>
    </div>
  </div>
</template>

<script lang="ts">
import { defineComponent, PropType } from 'vue'

export interface ColumnProps {
  id: number
  title: string
  avatar?: string
  description: string
}

export default defineComponent({
  name: 'ColumnList',
  props: {
    list: {
      type: Array as PropType<ColumnProps[]>,
      required: true
    }
  },
  setup(props: PropType) {
    const columnList = props.list.map((column: ColumnProps) => {
      if (!column.avatar) {
        column.avatar = require('@/assets/avatar.jpg')
      }
      return column
    })
    return {
      columnList
    }
  }
})
</script>
